<template>
  <div class="pine-3d-box" ref="pineChart3d"></div>
</template>
<script>
import echarts from 'echarts'
export default {
  name: 'echarts3d',
  data () {
    return {
      pineData: [
        { name: '专利申请量', value: 30, itemStyle: { color: '#73C4F7' }, startRatio: 0, endRatio: 10 },
        { name: '商标申请量', value: 45, itemStyle: { color: '#7BDDD0' }, startRatio: 0.7, endRatio: 1 },
        { name: '软件著作量', value: 6, itemStyle: { color: '#FAC858' }, startRatio: 0.7, endRatio: 1 },
        { name: '作品著作量', value: 14, itemStyle: { color: '#5DA6FC' }, startRatio: 0.7, endRatio: 1 },
        { name: 'ICP', value: 0, itemStyle: { color: '#ccc' }, startRatio: 0.7, endRatio: 1 },
      ],
      optionConfig: {}
    }
  },
  methods: {
    getPie3D(pieData, internalDiameterRatio) {

let series = [];
let sumValue = 0;
let startValue = 0;
let endValue = 0;
let legendData = [];
let k = 1;

// 为每一个饼图数据，生成一个 series-surface 配置
for (let i = 0; i < pieData.length; i++) {

    sumValue += pieData[i].value;

    let seriesItem = {
        name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,
        type: 'surface',
       
        parametric: true,
        wireframe: {
            show: false
        },
        pieData: pieData[i],
        pieStatus: {
            selected: false,
            hovered: false,
            k: k
        },
        labelLine:{
            show:true
        },
        label:{
            show:true
        }
    };

    if (typeof pieData[i].itemStyle != 'undefined') {

        let itemStyle = {};

        typeof pieData[i].itemStyle.color != 'undefined' ? itemStyle.color = pieData[i].itemStyle.color : null;
        typeof pieData[i].itemStyle.opacity != 'undefined' ? itemStyle.opacity = pieData[i].itemStyle.opacity : null;

        seriesItem.itemStyle = itemStyle;
    }
    series.push(seriesItem);
}

// 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
// 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
for (let i = 0; i < series.length; i++) {
    endValue = startValue + series[i].pieData.value;
    console.log(series[i]);
    series[i].pieData.startRatio = startValue / sumValue;
    series[i].pieData.endRatio = endValue / sumValue;
    series[i].parametricEquation = this.getParametricEquation(series[i].pieData.startRatio, series[i].pieData.endRatio, false, false, k,series[i].pieData.value);

    startValue = endValue;

    legendData.push(series[i].name);
}

let boxHeight = this.getHeight3D(series, 3);

// // 补充一个透明的圆环，用于支撑高亮功能的近似实现。
    
series.push({
        name: 'mouseoutSeries',
        type: 'surface',
        parametric: true,
        wireframe: {
            show: false,
        },
        itemStyle: {
            opacity: 0.1,
            color: '#659FFF',
            barBorderRadius: [0, 3, 3, 0],
        },
        parametricEquation: {
            u: {
                min: 0,
                max: Math.PI * 2,
                step: Math.PI / 200,
            },
            v: {
                min: 0,
                max: Math.PI,
                step: Math.PI / 200,
            },
            x: function (u, v) {
                return ((Math.sin(v) * Math.sin(u) + Math.sin(u)) / Math.PI) * 2.9;
            },
            y: function (u, v) {
                return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2.9;
            },
            z: function (u, v) {
                return Math.cos(v) > 0 ? -2.5 : -2.5;
            },
        },
    });

// 准备待返回的配置项，把准备好的 legendData、series 传入。
let that = this
let option = {
    tooltip: {
        formatter: params => {
            if (params.seriesName !== 'mouseoutSeries') {
                return `${params.seriesName}<br/><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color};"></span>${option.series[params.seriesIndex].pieData.value}`;
            }
        }
    },
    // labelLine: {
    //         show: true,
    //     },
    // label:{
    //     show:true,
    //     formatter: "{b} \n {c}   {d}%"
    // },
    legend: {
        data: legendData,
        orient: 'vertical',
        icon: 'circle',
        itemWidth: 8,
        itemHeight: 8,
        itemGap: 15,
        right:'5%',
        top:'20%',
        textStyle:{
            color:'#555',
            fontSize:12
        },
        formatter: function (name) {
          let value = ''
          that.pineData.forEach(v => {
            
            if (v.name === name) {
              value = v.value
            }
          })
          return name+`\xa0\xa0\xa0`+value+'件'
        }
    },
    xAxis3D: {
        min: -1,
        max: 1
    },
    yAxis3D: {
        min: -1,
        max: 1
    },
    zAxis3D: {
        min: -1,
        max: 1
    },
    grid3D: {
        show: false,
        boxHeight: boxHeight, //圆环的高度
        //top: '30%',
        bottom: '20%',
        left:'-15%',
        viewControl:{
            distance:300,
            alpha:25,
            beta:40,
            rotateSensitivity: 0, //设置为0无法旋转
            zoomSensitivity: 0, //设置为0无法缩放
            panSensitivity: 0, //设置为0无法平移
        },
        
    },
    series: series
};

return option;
},
    getHeight3D(series, height) {
        series.sort((a, b) => {
            return b.pieData.value - a.pieData.value;
        });
        return (height * 25) / series[0].pieData.value;
    },
    getParametricEquation(startRatio, endRatio, isSelected, isHovered, k,height) {

// 计算
let midRatio = (startRatio + endRatio) / 2;

let startRadian = startRatio * Math.PI * 2;
let endRadian = endRatio * Math.PI * 2;
let midRadian = midRatio * Math.PI * 2;

// 如果只有一个扇形，则不实现选中效果。
if (startRatio === 0 && endRatio === 1) {
    isSelected = false;
}

// 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
k = typeof k !== 'undefined' ? k : 1 / 3 ;

// 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;

// 计算高亮效果的放大比例（未高亮，则比例为 1）
let hoverRate = isHovered ? 1.05 : 0.75;

// 返回曲面参数方程
return {

    u: {
        min: -Math.PI,
        max: Math.PI * 3,
        step: Math.PI / 32
    },
    
    v: {
        min: 0,
        max: Math.PI * 2,
        step: Math.PI / 20
    },
    
    x: function(u, v) {
        if (u < startRadian) {
            return offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
        }
        if (u > endRadian ){
            return offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
        }
        return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
    },
    
    y: function(u, v) {
        if (u < startRadian) {
            return offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
        }
        if (u > endRadian ){
            return offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
        }
        return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
    },
    
    z: function(u, v) {
        if (u < - Math.PI * 0.5 ) {
            return Math.sin(u);
        }
        if (u > Math.PI * 2.5 ){
            return Math.sin(u);
        }
        return Math.sin(v) > 0 ? 1*height : -1;
    }
};
    },
    chart () {
      let option = {}
      option = this.getPie3D(this.pineData,0);
      //是否需要label指引线，如果要就添加一个透明的2d饼状图并调整角度使得labelLine和3d的饼状图对齐，并再次setOption
      let lineArr = []
      lineArr = JSON.parse(JSON.stringify(this.pineData))
      lineArr.forEach((v, i) => {
        if (v.value === 0) {
          lineArr.splice(i, 1)
        }
      })
      option.series.push({
          name: 'pie2d',
          type: 'pie',
          labelLine: {
            normal: {
              show: true,
              length: 40,
              length2: 50,
              lineStyle: {
                cap: "round"
              }
            }
              
          },
          label: {
            position: 'top',
            normal: {
              formatter: "占{d}%",
              padding: [0, -40],
              height:120,
              lineHeight:100,
              color: '#222',
              rich: {
                a: {
                    width:28,
                    height:28,
                    lineHeight: 20,
                    verticalAlign: "top",
                },
              }
            },
            
          },
          startAngle: -50, //起始角度，支持范围[0, 360]。
          clockwise: false, //饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
          radius: ['50%', '50%'],
          center: ['37%', '45%'], //指示线的位置
          data: lineArr,
          itemStyle: {
              opacity: 0,
          },
      });
      let chart = echarts.init(this.$refs.pineChart3d)
      chart.setOption(option)
      window.addEventListener('resize', () => {
        if (chart) {
          chart.resize()
        }
      })
    }
  },
  mounted () {
    this.chart()
  }
}
</script>
<style lang="scss">
.pine-3d-box{
  width:auto;
  height:300px;
}
</style>